Abstract
A hypersonic free jet flowing at hypersonic speed past an aerodynamic model in a very large test chamber provides proper conditions for the study of signal attenuation through an ion sheath. The test chamber surrounding the free jet is large enough to house all the necessary radar gear, so that all the electronics (both transmitting and receiving) is housed inside the wind tunnel. The pressure in the interior of the wind tunnel can be maintained continuously at those corresponding to altitudes of from 130,000 to 400,000 ft by use of cryopumping. Flows at Mach numbers up to 15 and stagnation temperatures near 5,000°K will be produced by the combination of cryopumping and r.f. heating of the gas. Electron densities of the order of 10 12 are expected. The wind tunnel facility, the instrumentation and the testing programme will be described.
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